Basic geometrical terms

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Across
  1. 6. Two rays that have a common endpoint and form a line
  2. 7. Points that lie in the same plane
  3. 8. Undefined term in geometry that can be represented by the horizon
Down
  1. 1. Points that lie in the same line
  2. 2. Figure that consists of endpoints A and B and all points between them
  3. 3. Undefined term in geometry that can be represented by a dot
  4. 4. Portion of a line that starts at a point (endpoint) and continues forever in one direction
  5. 5. Undefined term in geometry that can be suggested by a wall